Re: [PATCH v2 4/4] power: reset: Add new driver for RZ/V2M PWC poweroff

Geert Uytterhoeven
2023-01-03T08:26:33Z

Hi Fabrizio,

On Wed, Dec 21, 2022 at 10:09 PM Fabrizio Castro
<fabrizio.castro.jz@renesas.com> wrote:
> The RZ/V2M PWC IP controls external power supplies and therefore
> can turn the power supplies off when powering down the system.
>
> Add driver to poweroff the system.
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
> ---
>
> v1->v2: Dropped OF match table and syscon as a result of the change in
> DT model

Thanks for your patch!

> --- /dev/null
> +++ b/drivers/power/reset/rzv2m-pwc-poweroff.c
> @@ -0,0 +1,67 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2022 Renesas Electronics Corporation
> + *
> + * Reset driver for Renesas RZ/V2M External Power Sequence Controller (PWC)
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/reboot.h>
> +#include "../../mfd/rzv2m-pwc.h"
> +
> +#define PWC_PWCRST_RSTSOFTAX 0x1
> +#define PWC_PWCCKEN_ENGCKMAIN 0x1
> +#define PWC_PWCCTL_PWOFF 0x1
> +
> +struct rzv2m_pwc_poweroff_priv {
> + void __iomem *base;
> + struct device *dev;
> +};
> +
> +static int rzv2m_pwc_poweroff(struct sys_off_data *data)
> +{
> + struct rzv2m_pwc_poweroff_priv *priv =
> + (struct rzv2m_pwc_poweroff_priv *)data->cb_data;

No need for this cast.

> +
> + writel(PWC_PWCRST_RSTSOFTAX, priv->base + PWC_PWCRST);
> + writel(PWC_PWCCKEN_ENGCKMAIN, priv->base + PWC_PWCCKEN);
> + writel(PWC_PWCCTL_PWOFF, priv->base + PWC_PWCCTL);
> +
> + mdelay(150);
> +
> + dev_err(priv->dev, "Failed to power off the system");
> +
> + return NOTIFY_DONE;
> +}

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds